We Challenge You to Find a Lighter Saddle Than This 38g Gelu

Most performance cyclists talk about saving 50g here, 80g there, maybe 150g if they are lucky.

Then Gelu turns up with a carbon saddle that starts at 38g.

Yes, 38g.

That is not a typo. The Gelu K-3 is a handmade carbon saddle from Portugal, built for riders chasing serious weight savings, a cleaner build and something far more personal than another standard black saddle.

But the most interesting part of Gelu is not just the weight. It is the fit logic.

Gelu saddles are one size and unisex. No 143mm. No 155mm. No separate men’s and women’s versions.

That sounds unusual if you are used to normal saddle fitting, but Gelu is not trying to work like a normal padded saddle.

Most traditional saddles are chosen by sit-bone width because the support is concentrated around the outer tips of the ischial bones, with the foam and shell deforming under the rider. Gelu uses a different system. The carbon shell is shaped to support the inner part of the pelvic bone structure, following the rider’s natural angle and curvature rather than relying on sponge compression.

Gelu saddles are not one-size because sizing does not matter. They are one-size because the saddle is designed around pelvic shape, lateral carbon flex and pressure relief instead of traditional sit-bone-width foam support.

The 38g Headline Saddle: Gelu K3

The Gelu K3 is the saddle people notice first. At around 38g, it is built for riders chasing the absolute lowest possible weight. This is the weight-weenie option. The hill climb option. The “I want the lightest saddle I can realistically ride” option.

But that does not mean it is the right saddle for everyone. The K3 is a specialist saddle with a lower rider-weight limit than some of the stronger Gelu models, so it needs to be chosen properly.

That is the point of Gelu. You do not just pick the lightest one. You pick the right shape and build for how you ride.

Why Gelu Saddles Only Come in One Size

Most saddle brands make you choose a width. That usually means measuring sit bones, choosing between narrow and wide options, then hoping the shape works once you ride it.

Gelu takes a different approach. Their saddles are designed around a full-carbon structure, a large central opening and a specific rail layout. The rear rail attachment area is parallel rather than widely flared, which allows the saddle’s side tabs to flex slightly.

That flex is not there by accident. It is part of how the saddle adapts to the rider.

Gelu’s design is intended to support the inner part of the pelvic bone structure, rather than simply placing the rider’s weight onto the outer sit-bone tips. The side flaps are shaped to follow the natural curvature of the pelvis, with lateral flex helping the saddle accommodate pelvic angle and small asymmetries.

That is why Gelu describes its saddles as one size and unisex. The saddle shape matters. The rider use matters. The build version matters. But you do not need to choose a saddle width.

What About Pressure and Comfort?

A 38g carbon saddle will naturally raise one obvious question. Is it comfortable?

The honest answer is that a Gelu is not trying to feel like a thick padded endurance saddle. It is still a full-carbon saddle. If you want deep foam and a soft padded feel, this is not that.

But comfort is not only about padding. Comfort comes from shape, support, pressure relief, flex and whether the saddle suits your position.

Gelu saddles use a generous central opening to reduce pressure through the soft-tissue and prostate area. Gelu also says its saddles are urologically approved, with the design intended to remove pressure and discomfort in that central zone.

The right comparison is not carbon versus comfort. It is whether this shape and support system suits the way you sit on the bike.

How Gelu Saddle Names Work

Gelu has a lot of saddle models, and the names are not exactly self-explanatory: A1, K3, P1, F3, J1 and so on.

The simple version is this:

• The letter is the saddle shape.
• The number is the build version.

So an A1 and A3 are from the same shape family, but the A1 is the stronger, more versatile option, while the A3 is lighter and more specialist.

There is no current "2" model you need to worry about. For most riders, the decision is simple: do you want the stronger version, or the lighter version?

Are Gelu Saddles Safe?

When a saddle weighs 38g, people naturally ask if it is strong enough.

The answer is that Gelu does not make one saddle for every rider and every use. The range includes different build versions with different rider-weight limits and intended uses.

The lightest models are more specialist. They are not the default recommendation for every rider. That is why Gelu also offers stronger versions like the A1, K4, K3+, P1 and the upcoming R-Series models.

The saddle needs to match the rider, the bike and the use. A lighter road rider chasing the lowest possible build may suit one model. A gravel rider, heavier rider or everyday rider may be better on a stronger version.

The 38g number gets attention, but it is not the whole story.

Gelu K-Series: The Best-Selling Light Saddle Family

The K-Series is Gelu’s best-selling saddle family and the headline weight-weenie range. This is where you find the ultra-light Gelu saddles, including the 38g K3.

The K-Series is compact, flat and minimal. It suits riders chasing serious weight savings without a bulky saddle sitting on top of the bike.

Gelu K3

The K3 is the lightest option. It is for riders who want the lowest possible number on the scale and are willing to choose carefully around rider weight and use.

Best suited to: road bikes, hill climbs, weight-weenie builds and light riders chasing the lowest possible saddle weight.

Gelu K3+

The K3+ keeps the K-Series idea but adds more strength. It gives you the K-Series shape with more margin, making it a better option for gravel riders or heavier riders who like the K shape but should not be on the absolute lightest version.

Best suited to: gravel bikes, road bikes, riders wanting low weight with more strength and riders who like the K shape but need more margin.

Gelu K4

The K4 is probably the most practical K-Series saddle for many riders. It is still extremely light by normal saddle standards, but it gives more rider-weight margin and comes in at a more approachable price than the most extreme models.

Best suited to: road bikes, MTB, fast recreational riding and riders who want the K-Series feel without going too extreme.

Gelu K1

The K1 sits in the premium K-Series space. It is very light, very clean and more robust than the K3.

Best suited to: premium road builds, lightweight custom bikes and riders wanting a very light saddle with more practicality than the K3.

Check out the K-Series Carbon Saddles just here.

Gelu A-Series: The Best All-Round Starting Point

If the K-Series is the headline weight-weenie range, the A-Series is probably the easier starting point for many riders.

The A-Series is a modern, short-nose style saddle that works across road, gravel, MTB and triathlon use.

Gelu A1

The A1 is one of the safest Gelu recommendations. It is light, strong and versatile, making it a very good place to start if you want to try Gelu without going straight to the most extreme saddle in the range.

Best suited to: road bikes, gravel bikes, MTB, triathlon and riders wanting one saddle that covers a lot.

Gelu A3

The A3 is the lighter version of the A-Series shape. It suits riders who like the A-Series idea but want to push the weight lower.

Best suited to: road bikes, lightweight builds and riders chasing lower weight with a modern short-nose shape.

Check out the Gelu A-Series Carbon Saddles just here

Gelu P-Series: The TT and Triathlon Saddle

The P-Series is the easiest range to understand. P is the forward-position saddle family.

This is the Gelu option for riders who sit further forward on the bike, especially in time trial and triathlon positions.

Gelu P1

The P1 is the stronger and more versatile TT / tri option.

Best suited to: triathlon bikes, time trial bikes, aero road positions and riders who sit forward on the saddle nose.

Gelu P3

The P3 is the lighter version.

Best suited to: lighter triathletes, TT riders chasing lower weight and race-focused aero builds.

Check out the Gelu P-Series Carbon Saddles just here.

Gelu E-Series: Compact Support

The E-Series is Gelu’s compact support saddle. It is for riders who want a short, light, full-carbon saddle with a more planted front section and a secure feel under load.

It is not the lightest Gelu shape. It is not the longest Gelu shape. It is not the spring comfort shape. It is the compact, supportive option.

Gelu E1

The E1 is the stronger and more versatile E-Series option. It is the better choice if you want the E-Series shape with more rider-weight margin and a more practical everyday build.

Best suited to: road bikes, MTB, fast recreational riding and riders wanting a stronger compact carbon saddle.

Gelu E3

The E3 is the lighter version of the same E-Series shape. It suits lighter riders who want to push the weight lower while keeping the compact support feel of the E-Series.

Best suited to: road bikes, lightweight builds, lighter riders and riders wanting the lighter E-Series option.

Check out the Gelu E-Series Carbon Saddles just here.

Gelu J-Series: Carbon Spring Comfort

The J-Series is where Gelu gets more interesting. These saddles use a carbon spring design to help with vibration and comfort.

They are still light, but the reason to choose J is not just the scale number. It is the ride feel.

Gelu J1

The J1 is the stronger carbon spring comfort saddle.

Best suited to: gravel bikes, rough roads, longer rides and riders wanting more comfort without going back to a heavy padded saddle.

Gelu J3

The J3 is the lighter version of the J shape.

Best suited to: road bikes, urban bikes and lighter riders wanting the carbon spring feel.

Check out the Gelu J-Series Carbon Saddles just here.

Gelu F-Series: World's best Gravel Saddle

The F-Series is similar in concept to the J-Series, but with a flatter feel.

If the J-Series is the comfort spring option, the F-Series is the flatter version for riders who prefer a more level saddle platform.

Gelu F1

The F1 is the stronger flat spring saddle.

Best suited to: gravel bikes, road bikes, urban bikes and riders wanting vibration control with a flatter shape.

Gelu F3

The F3 is the lighter version.

Best suited to: road bikes, urban performance builds and lighter riders wanting a flat spring saddle.

Check out the F-Series saddles just here.

Gelu S-Series: Longer Platform

The S-Series is a longer saddle shape. This can suit riders who move around more on the saddle, rather than staying locked into one fixed position.

Gelu S1

The S1 is the stronger S-Series saddle.

Best suited to: road bikes, MTB, recreational performance riding and riders who like a longer saddle platform.

Gelu S3

The S3 is the lighter version.

Best suited to: road bikes, lighter riders and riders who want a longer platform with lower weight.

Check out the Gelu S-Series Carbon Saddles just here.

Gelu C-3: Classic Spring-Inspired Comfort

The C-Series is more niche. It has a classic spring-inspired look but uses Gelu’s carbon construction.

It is less of a pure race saddle and more of a comfort-focused option for the right build.

Gelu C3

Best suited to: urban bikes, e-bikes, comfort-focused gravel builds and riders wanting something different and highly personal.  See that one just here.

Coming Soon: Gelu R-Series

Gelu is also launching a new ultralight R-Series saddle.

The R model is different from the K-Series. It has longer and thicker rails for a wider adjustment range, a shorter and more robust nose, and a reinforced central opening with a rounded carbon profile.

It also has a horizontal blade between the rear tabs. That adds strength to the saddle and is also being developed as a guide point for a future safety device concept.

The R-Series will sit in three versions:

• R1: approx. 54g, road / MTB / gravel, max rider weight around 110kg.
• R3: approx. 45g, road only, max rider weight around 85kg.
• R3+: approx. 50g, road / gravel, max rider weight around 100kg.

This looks like it could become a very important Gelu saddle family. It keeps the ultra-light concept, but adds more adjustment range and a more robust nose than the K-Series.

Is This Just a Weight-Weenie Gimmick?

No, but it depends what you are trying to build.

A saddle will not transform a bike by itself. But on a serious lightweight build, every exposed component matters: saddle, seatpost, cages, cockpit, wheels and mounts.

They all add up.

Gelu fits that mindset. It is for riders who care about weight, finish and the final look of the whole bike.

If you just want a normal saddle, buy a normal saddle. If you want the bike to feel lighter, look cleaner and carry a personal finish that actually suits the build, Gelu starts to make a lot more sense.

Why Gelu Saddles Are Built Differently

Gelu saddles are not mass-market saddles with a carbon-look finish.

They are handmade carbon saddles built in small volumes, with custom finish options and very low weights. That is what you are paying for.

The price makes more sense when the saddle is part of a serious lightweight build, especially one where the finish matters as much as the number on the scale.

Will It Fit My Seatpost?

Before ordering, seatpost compatibility matters.

These are carbon saddles, so your seatpost clamp needs to suit carbon rails. Some seatposts use clamps that are perfect for round metal rails but not ideal for oval carbon rails.

Torque also matters. Do not just clamp it, guess the tension and hope for the best.

If you are unsure, send through your seatpost model before ordering and we can check the right option.

Will It Damage My Bibs?

As with any full-carbon saddle, setup matters.

Saddle height, tilt and position should be checked properly. If a saddle is too high, too nose-up, too nose-down or too far forward, you can create problems that have nothing to do with the saddle itself.

The finish and edges also matter, which is one of the reasons Gelu’s handmade finish is important.

Which Gelu Saddle Should You Choose?

• Lightest possible: K3.
• Safer K-Series option: K3+ or K4.
• Best all-round Gelu saddle: A1.
• TT or triathlon: P1 or P3.
• Rough-road comfort: J1 or F1.
• Longer saddle platform: S-Series.
• Urban, classic or comfort-focused: C3.
• Next-generation ultralight platform: R-Series.

Not Sure Which Gelu Saddle Suits You?

This is where it helps to ask.

Gelu does the same thing when helping customers directly. They ask what saddle the rider currently uses, or which saddle they have used and liked before, then compare that with the Gelu range.

That is exactly how we would approach it. Send through:

• Your current saddle
• What you like about it
• What you dislike about it
• Your bike
• Your riding style
• Your rider weight
• Whether this is for road, gravel, MTB, TT or triathlon

Then we can point you towards the right Gelu options. Not just the lightest one. The right one.

The Best Part: You Can Make It Yours

The weight is the first thing people notice, but the customisation is what makes Gelu really interesting.

These saddles can be personalised with colour, logos, words and design details to suit your bike. That means you are not just buying a lighter saddle. You can make it look like it belongs on your own build.

A Gelu saddle gives you a lighter, cleaner and more personal bike, with a handmade carbon finish to suit your own build.

Final Word

The Gelu range looks confusing at first. There are a lot of saddles. The names do not explain much. The weights are so low they almost sound made up. And the idea of a one-size carbon saddle will feel completely different if you are used to normal saddle fitting.

But once you understand the logic, it becomes much simpler.

Gelu saddles are not normal padded saddles. They use a different support system, a different rail layout and a different approach to fit.

Choose the shape first. Then choose the build level.

For most riders, that means starting with the A1, K4, K3+, P1, or possibly the new R-Series depending on the bike and the type of riding.

For the rider chasing the lightest possible option, the K-3 is the one that grabs all the attention.

At 38g, it should.

We challenge you to find a lighter saddle you would seriously consider putting on a real bike.